Well I designed my Nexus D20 game to deal with these issues. I took a lot from Spycraft and SWSE but I went a bit farther.
Guns are realistic and lethal from one shot. They are based on the idea of a character with no real skill or dex can kill a person with one shot from a light pistol. Heavier weapons are ever more lethal.
HPs don't go up with level. You have about 20 + toughness as DR.
Combat is extremely quick. You have one roll per action. No damage roll. No defense roll. No saves. One shot is one roll for the attacker and defender gets no rolls. No confirming criticals.
Getting hit is bad. You take damage penalties to everything for each shot and one shot can stun, stagger or even kill you. Damage penalties apply to your defenses as well so you become an easier target even after one shot.
Your margin of success increases the damage level so a good roll is a good roll. You can't have a good attack roll and a bad damage roll.
There are a lot of feats and you get two per level. Each feat makes sense and has value. There is a feat list per skill. BAB, Saves, and Defenses are all a part of the skill system. The skill levels are easy to understand and make sense in the real world. They are alot faster to use as well.
Every skill is Attrib + Skill Rank + Class Level Bonus. Skill Ranks are Basic (+0), Trained (+4). Focused (+8), and Mastery (+12). Class Level Bonus is your Class Level/2 rounded down. So if I have a 6th level character with Dex +2 that is trained with Ranged Weapons then I have 9 + 1d20.
It's simple to use and fast to play and run. It's also designed for play in all eras. I'm working up an equipment and vehicle list for each tech level. So far I'm up to the Fusion Age which is after the Cyber Age (which is after the Modern Age).
Guns are realistic and lethal from one shot. They are based on the idea of a character with no real skill or dex can kill a person with one shot from a light pistol. Heavier weapons are ever more lethal.
HPs don't go up with level. You have about 20 + toughness as DR.
Combat is extremely quick. You have one roll per action. No damage roll. No defense roll. No saves. One shot is one roll for the attacker and defender gets no rolls. No confirming criticals.
Getting hit is bad. You take damage penalties to everything for each shot and one shot can stun, stagger or even kill you. Damage penalties apply to your defenses as well so you become an easier target even after one shot.
Your margin of success increases the damage level so a good roll is a good roll. You can't have a good attack roll and a bad damage roll.
There are a lot of feats and you get two per level. Each feat makes sense and has value. There is a feat list per skill. BAB, Saves, and Defenses are all a part of the skill system. The skill levels are easy to understand and make sense in the real world. They are alot faster to use as well.
Every skill is Attrib + Skill Rank + Class Level Bonus. Skill Ranks are Basic (+0), Trained (+4). Focused (+8), and Mastery (+12). Class Level Bonus is your Class Level/2 rounded down. So if I have a 6th level character with Dex +2 that is trained with Ranged Weapons then I have 9 + 1d20.
It's simple to use and fast to play and run. It's also designed for play in all eras. I'm working up an equipment and vehicle list for each tech level. So far I'm up to the Fusion Age which is after the Cyber Age (which is after the Modern Age).